(d)
FD command monitoring The FD pitch and yaw control commands are computed in the command and monitoring channels and then compared (Ref. Fig. 008) The result of these comparisons is used to generate the FG HEALTHY signal. (Ref. para 2. A. (2) Internal Monitoring Logic) In TAKE OFF, LANDING and GO AROUND modes, the pitch and yaw outer loop commands are computed in the command and monitoring channels.
(6)
Removal of FD Commands (Ref. Fig. 009) The FD commands can be removed in two ways:
(a) Removal manual control The crew can clear the FD commands by means of the FD pushbutton switches located on the FCU. Action on one FD pushbutton switch results in:
-Extinguishing of the FD P/B
-Removal of the FD commands (tendency bars or flight path
director symbols) on the associated PFD. A second action on the illuminated pushbutton switch leads to:
-Illumination of the P/B (three green bars)
-Display of the FD commands.
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FD Basic Loops
Figure 007
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FD Command Monitoring
Figure 008
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INTENTIONALLY BLANK
1 1
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Removal of FD Commands
Figure 009
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1 The FD pushbutton switches come on automatically:
-
Upon energization
-
Upon loss of the AP, the ROLL OUT mode being active.
(b) Logic - controlled removal The FD commands (on the three axes) are delivered to the DMCs on three different labels:
-
Label 141 PITCH FD BAR
-
Label 140 ROLL FD BAR
-
Label 143 YAW FD BAR.
This logic orders the DMCs to clear a command by forcing the
status matrix of the corresponding label to NCD:
-
NCD on the three labels when the FD ENGD condition is lost
-
NCD on the label 141 when no longitudinal mode is engaged or when the ROLL OUT mode is active
-
NCD on the label 140 when no lateral mode is engaged or when the RUNWAY LOC or the ROLL OUT modes are active
-
NCD on the label 143 as long as the RUNWAY LOC, ROLL OUT or ALIGN modes are not active.
(7) FD Display Flashing The FMGCs can send a command to the DMCs to make the FD bars flash.
(a)
FD pitch bar
This bar flashes in the following conditions:
-When the transmission of the glide data is interrupted above 100 ft. with the G/S CPT, GS/TRACK and LAND TRACK modes engaged.
-
If the ALT ACQ mode is lost further to altitude reference change (the bar flashes for 10 s).
-
If the V/S mode is engaged (further to pilot action or loss of the lateral approach mode) with the G/S CPT, G/S TRACK, LAND TRACK or FINAL DESCENT modes engaged (the bar flashes for 10 s).
-When one AP or FD is engaged, when no AP/FD were previously engaged (the bar flashes for 10 s).
(b)
FD roll bar
This bar flashes in the following conditions:
-When the transmission of the LOC data is interrupted above 15 ft. with the LOC CPT, LOC TRACK and LAND TRACK modes engaged.
-If the HDG mode is engaged (further to pilot action or loss of the longitudinal approach mode) with the LOC CPT, LOC TRACK, LAND TRACK modes engaged or in the NAV mode associated with RNAV approach (the bar flashes for 10 s).
-When one AP or FD is engaged, when no AP/FD were previously engaged (the bar flashes for 10 s).
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(c) Flight path vector (FPV) The vector flashes when one of the conditions mentioned above is present.
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(1) General The AP is engaged through two pushbutton switches (AP1 and AP2) located on the center section of the FCU. In cruise only one AP can be engaged at a time (priority to the last AP engaged). Both APs can be engaged when the following modes are active or armed:
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